Data Sufficiency - Vikas Saini - Part 2

A ) Statement I alone is sufficient.B ) Statement II alone is sufficient.C ) Both statement taken together are sufficient to answer this question.D ) Each statement alone is sufficient.E ) Both statements together are not sufficient.

Q1. Is X = 3Y ?I. X^2 – 9Y^2 = 0.II. (X – 3Y)^2 = 0.

Solution :-From statement I, X^2 = 9Y^2X = 3Y / -3YNot Sufficient.

From statement II, X – 3Y = 0.X = 3YSufficient.

Hence B.

Q2. Line xy is of length 8 cm and point z divides line xy. What is the length of xz ?I. length of yz is 5 cm.II. point z divides line xy externally.

Solution :-From statement I, we can’t say about division that it’s external or internal.From statement II, it’s given z divides line externally.If both statements are taken together, length of xz can be find.

Q.12. How many books are on the bookshelf ?I. The bookshelf is 12 feet long.II. The average weight of each book is 1.2 pounds.

Solution :-From statement I, we know how long bookshelf is, but not given width of each book.Therefore it’s insufficient.From statement II, it’s given only weight of each book. It is also not sufficient.